Are most REOs hidden on Zillow?

[Wes Farmer]

Here is an example of what I mean. If you search in Owensboro, KY on Zillow there are four properties listed under foreclosure. Does that mean there are only four REOs listed or are some of the retail properties likely REOs that are not advertised as such or are hidden? If so how do you go about finding which ones are which? Would that require MLS access to read the listing agents notes?